EP3434833A1 - Vereinfachtes verfahren zur prüfung einer rückflussverhindereranordnung - Google Patents

Vereinfachtes verfahren zur prüfung einer rückflussverhindereranordnung Download PDF

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Publication number
EP3434833A1
EP3434833A1 EP18185257.5A EP18185257A EP3434833A1 EP 3434833 A1 EP3434833 A1 EP 3434833A1 EP 18185257 A EP18185257 A EP 18185257A EP 3434833 A1 EP3434833 A1 EP 3434833A1
Authority
EP
European Patent Office
Prior art keywords
upstream
downstream
valve
shut
test cock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18185257.5A
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English (en)
French (fr)
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EP3434833B1 (de
Inventor
Victor Michaël Alexander BARENDREGT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HSF Samenwerkende Fabrieken BV
Original Assignee
HSF Samenwerkende Fabrieken BV
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Application filed by HSF Samenwerkende Fabrieken BV filed Critical HSF Samenwerkende Fabrieken BV
Priority to PL18185257T priority Critical patent/PL3434833T3/pl
Publication of EP3434833A1 publication Critical patent/EP3434833A1/de
Application granted granted Critical
Publication of EP3434833B1 publication Critical patent/EP3434833B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
    • E03B7/077—Arrangement of backflow preventing devices
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters

Definitions

  • the present invention relates to a method of testing a backflow preventer assembly and to a backflow preventer assembly.
  • Backflow preventer assemblies are known from the prior art. Said backflow preventers restrict a backflow into a liquid supply line. Liquid flowing back from a separate conduit system is often contaminated. In some situations a backflow of the contaminated liquid could be hazardous for people's health and should therefore be prevented.
  • a typical situation is a situation in which water from a pipeline is supplied to one or more taps which are used for drinking and other types of human consumption of water and also to a central heating installation. In such a situation it is undesirable that water from the central heating installation would flow back into the pipeline and subsequently be used for human consumption.
  • the backflow preventer prevents such a backflow.
  • a backflow preventer assembly comprises several moving parts. Failure of only a single part can already result in a failure of the entire backflow preventer assembly and result in health risks. In most countries it is therefore required by standards to periodically test, or inspect, the backflow preventer assembly. When a part of the assembly is not functioning, the backflow preventer assembly needs to be repaired or replaced.
  • US6675110B2 discloses a method for determining flow through a valve and for testing a relief valve in a backflow preventer. Said testing method includes determining differential pressures.
  • the measuring of differential pressures requires a complex and expensive device, for instance the device disclosed in US5566704(A ).
  • a problem with such a device is that the user needs to attach a number of conduits to the test cocks in a specific order. This becomes even a bigger problem when a user only rarely uses the device, because he tends to forget the specific order of attachment.
  • the invention is amongst others based on the recognition that there is a need in the field of the art for a simpler and more cost-effective alternative and the insight that such a simpler and more cost-effective alternative is possible.
  • Yet another object of the invention is to provide a more robust backflow preventer.
  • the present invention provides a method of testing a backflow preventer assembly, the backflow preventer assembly comprising at least:
  • a backflow preventer can be tested without using any differential pressure meter. This is a substantial advantage, because an absolute pressure can be measured with a simpler device, which does not require a user to remember a specific and complex order of attachment, which is required in case a differential pressure meter is used.
  • the first pressure and the second absolute pressure are measured with a manometer.
  • a manometer adds to the simplicity of the testing method, for the manometer only needs to be attached to one test cock at a time.
  • an order of testing the backflow preventer assembly comprises the following steps in the given order:
  • testing the backflow preventer assembly on external leakage comprises the steps of:
  • testing the upstream shut off valve comprises the steps of:
  • testing the upstream check valve assembly comprises the steps of:
  • testing the downstream shut off valve comprises the steps of:
  • testing the downstream check valve assembly comprises the steps of:
  • testing the relief valve on shutting off comprises the steps of:
  • testing the functioning of the relief valve comprises the steps of:
  • testing the required opening pressure of the relief valve comprises the steps of:
  • the invention further provides a backflow preventer assembly, comprising:
  • the upstream check valve assembly and the relief valve are integrally connected.
  • FIG. 1 shows a cross-section of a backflow preventer assembly 1.
  • the backflow preventer assembly 1 comprises a backflow preventer 2.
  • the backflow preventer 2 comprises several parts.
  • the backflow preventer 2 has a housing 3 which comprises an inlet 4 and an outlet 5.
  • An upstream check valve assembly 6 is positioned in the housing 3 downstream of the inlet 4.
  • the upstream check valve assembly 6 is biased to a first closed position 7.
  • a downstream check valve assembly 8 is provided in the housing 3, downstream of the upstream check valve.
  • the downstream check valve is also biased to a second closed position 9.
  • An intermediate chamber 10 is positioned between the upstream and downstream check valve assemblies.
  • the intermediate chamber 10 has a discharge opening 11 at a bottom side 12 thereof.
  • the discharge opening 11 is provided for emptying the intermediate chamber 10.
  • a relief valve 13 is located in the housing 3, upstream of the downstream check valve assembly 8.
  • the relief valve 13 is configured to move between a third closed position 14 ( figure 2 ) in which it closes off the discharge opening 11, and an open position 15 ( figure 1 ) in which the discharge opening 11 is open, and vice versa.
  • the relief valve 13 and upstream check valve assembly 6 are integrated into a single valve assembly having two separate functions. Due to the integral construction, the relief valve 13 is biased to an open position 15.
  • the backflow preventer assembly 1 furthermore comprises an upstream test cock 16.
  • the upstream test cock 16 is positioned upstream of the upstream check valve assembly 6.
  • the upstream test cock 16 is configured to be attached to a liquid pressure measurement device 17.
  • the backflow preventer assembly 1 comprises a third test cock 33 connected to the intermediate chamber 10.
  • the third test cock 33 is not used.
  • the testing method according to the invention works with a backflow preventer assembly 1 comprising a third test cock 33 connected to the intermediate chamber 10.
  • the method according to the invention also works with a backflow preventer assembly 1 which does not comprise any test cock connected to the intermediate chamber 10, in other words does not comprise a third test cock 33.
  • Figure 3 , 4A and 4B show embodiments of the backflow preventer assembly free of any test cock connected to the intermediate chamber, so without a third test cock.
  • Figure 3 shows a manometer 27 as liquid pressure measurement device 17.
  • a downstream test cock 19 is positioned downstream of the downstream check valve.
  • the downstream test cock 19 is also configured to be attached to a liquid pressure measurement device 17, or manometer 27 as shown in figure 4A .
  • FIG. 4A still comprises a connector 34 to which the third test cock 33 can be connected.
  • this connector 34 serves no function and in a further embodiment as shown in figure 4B this connector can be removed.
  • FIG 4B an embodiment of a backflow preventer is shown which does not comprise any test cock connected to the intermediate chamber, nor does said backflow preventer 1 of figure 4B comprise a connector 34 to which a third test cock can be connected.
  • the backflow preventer assembly 1 further comprises an upstream shut off valve 21 positioned upstream of the upstream test cock 16, and a downstream shut off valve 22 positioned downstream of the downstream test cock 19.
  • the upstream shut off valve 21 and downstream shut off valve 22 each have an operating member.
  • An upstream zone 18 is defined between the upstream test check valve assembly and the upstream shut off valve 21.
  • a downstream zone 20 is defined between the downstream check valve assembly 8 and the downstream shut off valve 22.
  • the above described backflow preventer assembly can be provided as an assembly of interconnected parts, or as an integral device.
  • An order of testing the backflow preventer assembly 1 comprises the following steps in the given order:
  • testing on external leakage is done by first completely drying the outer surface 28 of the backflow preventer assembly 1. Drying is achieved by using a towel, or any other tool suited for drying the outer surface 28 of the backflow preventer assembly 1. After waiting a predetermined period of time, in particular one minute, the backflow preventer assembly 1 is visually checked for leakages. If a leakage is detected, it needs to be repaired.
  • the upstream shut off valve 21 and upstream check valve assembly 6 are tested on shutting off.
  • Testing the upstream shut off valve 21 first entails the step of closing the downstream shut off valve 22 and subsequently closing the upstream shut off valve 21.
  • the upstream test cock 16 is opened. When opening said upstream test cock 16, water tends to discharge from it. Also water tends to exit the discharge opening 11 during this step. Therefore a next step is to dry the upstream test cock 16 while maintaining a visible liquid level in the upstream test cock 16. Then it has to be determined what happens to the liquid level in the upstream test cock 16. There are three possibilities: the liquid level may rise, fall, or remain constant.
  • the upstream shut off valve 21 In case the liquid level rises, the upstream shut off valve 21 is considered to malfunction. To solve this problem, the upstream shut off valve 21 needs to be repaired, and the backflow preventer assembly 1 needs to be tested again starting with step B.
  • the backflow preventer assembly 1 is in the operation position when all shut off valves are opened.
  • the downstream shut off valve 22 is closed, then the upstream shut off valve 21 is closed.
  • the upstream test cock 16 is opened.
  • liquid tends to discharge from the said upstream test cock 16. Also liquid tends to exit the discharge opening 11.
  • the next step is therefore drying the opened upstream test cock 16, while keeping a liquid level inside the upstream test cock 16 visible.
  • the step that follows is determining whether the liquid level remains constant or drops.
  • the procedure continues by drying the discharge opening 11, and waiting a predetermined period of time, in particular 30 seconds. Then the discharge opening 11 is checked for dripping, wherein when liquid drips from the discharge opening 11, then the relief valve 13 is considered not to shut off adequately. When no liquid drips from the discharge opening 11, the upstream check valve assembly 6 is considered to malfunction. In both cases the backflow preventer 2 needs to be replaced, after which the backflow preventer assembly 1 needs to be tested again starting with step B. Then the upstream test cock 16 is closed, and the downstream shut off valve 22 is opened and subsequently the upstream shut off valve 21 is opened.
  • step C The next step in the testing method involves testing the downstream shut off valve 22 and the downstream check valve assembly 8: step C.
  • a liquid pressure measurement device 17 is coupled to the downstream test cock 19, after which the downstream test cock 19 is opened.
  • the downstream test cock 19 is closed and subsequently also the upstream shut off valve 21 is closed.
  • the upstream test cock 16 is opened. Liquid tends to discharge from the upstream test cock 16 when opening said upstream test cock 16.
  • a conduit system 30 which is located downstream of the downstream shut off valve 22 is depressurized. This can be done for example by opening a water tap and letting the liquid flow, thereby depressurizing said conduit system 30.
  • the liquid pressure measurement device 17, in particular a manometer 27, is used to determine the liquid pressure level at the downstream test cock 19. In particular a first pressure 23 development over time in the downstream zone 20 at the downstream test cock 19 is measured. When the liquid pressure decreases over time and the discharge opening 11 remains dry, then the downstream shut off valve 22 is considered to malfunction. If this is the case, then the downstream shut off valve 22 needs to be repaired, after which the steps of step C are repeated.
  • downstream test cock 19 and the upstream test cock 16 are closed. Then the downstream shut off valve 22 is opened and subsequently the upstream shut off valve 21 is opened.
  • the manometer 27 may be detached.
  • FIG. 5 shows that the relief valve 13 is tested threefold, namely on shutting off, on being stuck, and on its opening pressure 24.
  • the relief valve 13 is tested on shutting off, see box D1.
  • the first step entails closing the downstream shut off valve 22, and then drying the discharge opening 11. After waiting a predetermined period of time, in particular 30 seconds, the discharge opening 11 is inspected on dripping. If liquid drips from the discharge opening 11, then the relief valve 13 is considered not to shut off adequately. In that case the backflow preventer 2 needs to be replaced, and the previous steps of step D1 are repeated. Then the downstream shut off valve 22 is opened.
  • the relief valve 13 is tested on functioning, in particular on being stuck. Therefore the downstream shut off valve 22 and subsequently the upstream shut off valve 21 are closed.
  • the upstream test cock 16 is opened. Liquid tends to discharge from the upstream test cock 16 when opening said upstream test cock 16. Now it is determined whether liquid exits the discharge opening 11. The backflow preventer 2 should discharge liquid from the discharge opening 11. If this is not the case, then the relief valve 13 is stuck and thus considered to malfunction. The backflow preventer 2 then has to be replaced and the previous steps of step D2 are repeated. Then the upstream test cock 16 is closed, and the downstream shut off valve 22 is opened. Subsequently the upstream shut off valve 21 is opened.
  • the required opening pressure 24 of the relief valve 13 is tested. This entails attaching a liquid pressure measurement device 17, a manometer 27, to the upstream test cock 16. Then the upstream test cock 16 is opened, after which the upstream shut off valve 21 is closed.
  • a draining facility 31 is provided at substantially the same location as the manometer 27. The draining facility 31 may also be provided on a conduit of the manometer 27 itself, namely at the upstream zone 18. The next step is opening the draining facility 31. This lowers the pressure in the upstream zone 18. At a predetermined liquid pressure level the relief valve 13 should open resulting in a discharge of liquid from the discharge opening 11. As soon as liquid starts exiting the discharge opening 11, the draining facility 31 needs to be closed.
  • the liquid pressure level is determined by reading the manometer 27. If the liquid pressure level is below a predetermined threshold value, then the relief valve 13 does not open at the required liquid pressure level and thus does not function properly. In practice a threshold value of 0.14 bar is required. The backflow preventer 2 is to be replaced if the relief valve 13 does not functioning properly, and the previous steps of step D3 are repeated. Then the upstream test cock 16 is closed, the downstream shut off valve 22 is opened. Subsequently the upstream shut off valve 21 is opened.
  • An advantage of the present testing method is that only a simple manometer 27 is needed to be able to perform all steps.
  • the method thus entails testing the downstream shut off valve 22 and the downstream check valve assembly 8 by measuring a first pressure 23 development over time in the downstream zone 20 at the downstream test cock 19. It furthermore entails testing an opening pressure 24 of the relief valve 13 by closing the upstream shut off valve 21, gradually lowering the pressure in the upstream zone 18 by tapping off liquid from the upstream zone 18 via the upstream test cock 16 and by measuring a second absolute pressure 25 at the upstream test cock 16 at which fluid starts to discharge via the discharge opening 11 and comparing said absolute pressure to a required threshold pressure for the relief valve 13.
  • the manometer 27 measures the first pressure 23 and the second absolute pressure 25.
  • a backflow preventer assembly 1 according to the invention is shown, comprising:
  • the intermediate chamber 10 is free of test cocks.
  • An advantage of the testing method according to the invention is that a backflow preventer assembly 1 only requires two test cocks: a downstream test cock 19 connected to the downstream zone 20, and an upstream test cock 16 connected to the upstream zone 18.
  • the embodiments of figures 3 , 4A and 4B does not have a third test cock 33 connected to the intermediate chamber 10. This simplifies the backflow preventer assembly 1, thereby obtaining a more robust construction, as less parts are needed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • Examining Or Testing Airtightness (AREA)
EP18185257.5A 2017-07-24 2018-07-24 Vereinfachtes verfahren zur prüfung einer rückflussverhindereranordnung Active EP3434833B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18185257T PL3434833T3 (pl) 2017-07-24 2018-07-24 Uproszczony sposób sprawdzania zespołu zaworu zwrotnego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2019334A NL2019334B1 (en) 2017-07-24 2017-07-24 Simplified method for testing a backflow preventer assembly.

Publications (2)

Publication Number Publication Date
EP3434833A1 true EP3434833A1 (de) 2019-01-30
EP3434833B1 EP3434833B1 (de) 2020-03-18

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EP (1) EP3434833B1 (de)
NL (1) NL2019334B1 (de)
PL (1) PL3434833T3 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200355576A1 (en) * 2019-05-08 2020-11-12 Watts Regulator Co. Backflow prevention system test cock with a fluid sensor
US11739507B2 (en) 2020-12-09 2023-08-29 Watts Regulator Co. Test cock with integrated extraction tool
US11773992B2 (en) 2020-08-17 2023-10-03 Watts Regulator Co. Backflow prevention assembly with a linkage
US11795666B2 (en) 2019-05-08 2023-10-24 Watts Regulator Co. Wireless communication system within a mechanical room
US11821529B2 (en) 2020-08-17 2023-11-21 Watts Regulator Co. Reversible spring retention assembly for a valve
USD1021000S1 (en) 2021-08-17 2024-04-02 Watts Regulator Co. Valve assembly and body for same
US12000123B2 (en) 2019-12-10 2024-06-04 Watts Regulator Co. System for monitoring backflow preventer condition
US12123510B2 (en) 2021-08-17 2024-10-22 Watts Regulator Co. Compact valve assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5404905A (en) * 1994-04-25 1995-04-11 Lauria; Thomas J. Backflow preventer with failure indicator
US5566704A (en) 1995-01-06 1996-10-22 Watts Investment Company Backflow preventer and test cock assembly
US6675110B2 (en) 2002-01-15 2004-01-06 Watts Regulatoryco. Testing valve assemblies
US20040035467A1 (en) * 2002-04-03 2004-02-26 Willi Hecking Valve assembly for pipe disconnectors
EP1741843A2 (de) * 2005-07-04 2007-01-10 Hans Sasserath & Co Kg Systemtrenner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5404905A (en) * 1994-04-25 1995-04-11 Lauria; Thomas J. Backflow preventer with failure indicator
US5566704A (en) 1995-01-06 1996-10-22 Watts Investment Company Backflow preventer and test cock assembly
US6675110B2 (en) 2002-01-15 2004-01-06 Watts Regulatoryco. Testing valve assemblies
US20040035467A1 (en) * 2002-04-03 2004-02-26 Willi Hecking Valve assembly for pipe disconnectors
EP1741843A2 (de) * 2005-07-04 2007-01-10 Hans Sasserath & Co Kg Systemtrenner

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200355576A1 (en) * 2019-05-08 2020-11-12 Watts Regulator Co. Backflow prevention system test cock with a fluid sensor
US11795666B2 (en) 2019-05-08 2023-10-24 Watts Regulator Co. Wireless communication system within a mechanical room
US11815424B2 (en) * 2019-05-08 2023-11-14 Watts Regulator Co. Backflow prevention system test cock with a fluid sensor
US12000123B2 (en) 2019-12-10 2024-06-04 Watts Regulator Co. System for monitoring backflow preventer condition
US11773992B2 (en) 2020-08-17 2023-10-03 Watts Regulator Co. Backflow prevention assembly with a linkage
US11821529B2 (en) 2020-08-17 2023-11-21 Watts Regulator Co. Reversible spring retention assembly for a valve
US11835147B2 (en) 2020-08-17 2023-12-05 Watts Regulator Co. Backflow prevention assembly having a cartridge with dual zone testing
US11852254B2 (en) 2020-08-17 2023-12-26 Watts Regulator Co. Check valve cartridge with flow guide for compact backflow prevention assembly
US20240093797A1 (en) * 2020-08-17 2024-03-21 Watts Regulator Co. Telescoping spring retention assembly for a check valve
US11739507B2 (en) 2020-12-09 2023-08-29 Watts Regulator Co. Test cock with integrated extraction tool
USD1021000S1 (en) 2021-08-17 2024-04-02 Watts Regulator Co. Valve assembly and body for same
US12123510B2 (en) 2021-08-17 2024-10-22 Watts Regulator Co. Compact valve assembly

Also Published As

Publication number Publication date
NL2019334B1 (en) 2019-02-25
PL3434833T3 (pl) 2021-02-08
EP3434833B1 (de) 2020-03-18

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